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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/kmod.h>
3#include <linux/netdevice.h>
4#include <linux/etherdevice.h>
5#include <linux/rtnetlink.h>
6#include <linux/net_tstamp.h>
7#include <linux/wireless.h>
8#include <net/dsa.h>
9#include <net/wext.h>
10
11/*
12 * Map an interface index to its name (SIOCGIFNAME)
13 */
14
15/*
16 * We need this ioctl for efficient implementation of the
17 * if_indextoname() function required by the IPv6 API. Without
18 * it, we would have to search all the interfaces to find a
19 * match. --pb
20 */
21
22static int dev_ifname(struct net *net, struct ifreq *ifr)
23{
24 ifr->ifr_name[IFNAMSIZ-1] = 0;
25 return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
26}
27
28static gifconf_func_t *gifconf_list[NPROTO];
29
30/**
31 * register_gifconf - register a SIOCGIF handler
32 * @family: Address family
33 * @gifconf: Function handler
34 *
35 * Register protocol dependent address dumping routines. The handler
36 * that is passed must not be freed or reused until it has been replaced
37 * by another handler.
38 */
39int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
40{
41 if (family >= NPROTO)
42 return -EINVAL;
43 gifconf_list[family] = gifconf;
44 return 0;
45}
46EXPORT_SYMBOL(register_gifconf);
47
48/*
49 * Perform a SIOCGIFCONF call. This structure will change
50 * size eventually, and there is nothing I can do about it.
51 * Thus we will need a 'compatibility mode'.
52 */
53
54int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
55{
56 struct net_device *dev;
57 char __user *pos;
58 int len;
59 int total;
60 int i;
61
62 /*
63 * Fetch the caller's info block.
64 */
65
66 pos = ifc->ifc_buf;
67 len = ifc->ifc_len;
68
69 /*
70 * Loop over the interfaces, and write an info block for each.
71 */
72
73 total = 0;
74 for_each_netdev(net, dev) {
75 for (i = 0; i < NPROTO; i++) {
76 if (gifconf_list[i]) {
77 int done;
78 if (!pos)
79 done = gifconf_list[i](dev, NULL, 0, size);
80 else
81 done = gifconf_list[i](dev, pos + total,
82 len - total, size);
83 if (done < 0)
84 return -EFAULT;
85 total += done;
86 }
87 }
88 }
89
90 /*
91 * All done. Write the updated control block back to the caller.
92 */
93 ifc->ifc_len = total;
94
95 /*
96 * Both BSD and Solaris return 0 here, so we do too.
97 */
98 return 0;
99}
100
101/*
102 * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
103 */
104static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
105{
106 int err;
107 struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
108
109 if (!dev)
110 return -ENODEV;
111
112 switch (cmd) {
113 case SIOCGIFFLAGS: /* Get interface flags */
114 ifr->ifr_flags = (short) dev_get_flags(dev);
115 return 0;
116
117 case SIOCGIFMETRIC: /* Get the metric on the interface
118 (currently unused) */
119 ifr->ifr_metric = 0;
120 return 0;
121
122 case SIOCGIFMTU: /* Get the MTU of a device */
123 ifr->ifr_mtu = dev->mtu;
124 return 0;
125
126 case SIOCGIFSLAVE:
127 err = -EINVAL;
128 break;
129
130 case SIOCGIFMAP:
131 ifr->ifr_map.mem_start = dev->mem_start;
132 ifr->ifr_map.mem_end = dev->mem_end;
133 ifr->ifr_map.base_addr = dev->base_addr;
134 ifr->ifr_map.irq = dev->irq;
135 ifr->ifr_map.dma = dev->dma;
136 ifr->ifr_map.port = dev->if_port;
137 return 0;
138
139 case SIOCGIFINDEX:
140 ifr->ifr_ifindex = dev->ifindex;
141 return 0;
142
143 case SIOCGIFTXQLEN:
144 ifr->ifr_qlen = dev->tx_queue_len;
145 return 0;
146
147 default:
148 /* dev_ioctl() should ensure this case
149 * is never reached
150 */
151 WARN_ON(1);
152 err = -ENOTTY;
153 break;
154
155 }
156 return err;
157}
158
159static int net_hwtstamp_validate(struct ifreq *ifr)
160{
161 struct hwtstamp_config cfg;
162 enum hwtstamp_tx_types tx_type;
163 enum hwtstamp_rx_filters rx_filter;
164 int tx_type_valid = 0;
165 int rx_filter_valid = 0;
166
167 if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
168 return -EFAULT;
169
170 if (cfg.flags) /* reserved for future extensions */
171 return -EINVAL;
172
173 tx_type = cfg.tx_type;
174 rx_filter = cfg.rx_filter;
175
176 switch (tx_type) {
177 case HWTSTAMP_TX_OFF:
178 case HWTSTAMP_TX_ON:
179 case HWTSTAMP_TX_ONESTEP_SYNC:
180 case HWTSTAMP_TX_ONESTEP_P2P:
181 tx_type_valid = 1;
182 break;
183 case __HWTSTAMP_TX_CNT:
184 /* not a real value */
185 break;
186 }
187
188 switch (rx_filter) {
189 case HWTSTAMP_FILTER_NONE:
190 case HWTSTAMP_FILTER_ALL:
191 case HWTSTAMP_FILTER_SOME:
192 case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
193 case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
194 case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
195 case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
196 case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
197 case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
198 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
199 case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
200 case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
201 case HWTSTAMP_FILTER_PTP_V2_EVENT:
202 case HWTSTAMP_FILTER_PTP_V2_SYNC:
203 case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
204 case HWTSTAMP_FILTER_NTP_ALL:
205 rx_filter_valid = 1;
206 break;
207 case __HWTSTAMP_FILTER_CNT:
208 /* not a real value */
209 break;
210 }
211
212 if (!tx_type_valid || !rx_filter_valid)
213 return -ERANGE;
214
215 return 0;
216}
217
218static int dev_do_ioctl(struct net_device *dev,
219 struct ifreq *ifr, unsigned int cmd)
220{
221 const struct net_device_ops *ops = dev->netdev_ops;
222 int err;
223
224 err = dsa_ndo_do_ioctl(dev, ifr, cmd);
225 if (err == 0 || err != -EOPNOTSUPP)
226 return err;
227
228 if (ops->ndo_do_ioctl) {
229 if (netif_device_present(dev))
230 err = ops->ndo_do_ioctl(dev, ifr, cmd);
231 else
232 err = -ENODEV;
233 }
234
235 return err;
236}
237
238/*
239 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
240 */
241static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
242{
243 int err;
244 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
245 const struct net_device_ops *ops;
246
247 if (!dev)
248 return -ENODEV;
249
250 ops = dev->netdev_ops;
251
252 switch (cmd) {
253 case SIOCSIFFLAGS: /* Set interface flags */
254 return dev_change_flags(dev, ifr->ifr_flags, NULL);
255
256 case SIOCSIFMETRIC: /* Set the metric on the interface
257 (currently unused) */
258 return -EOPNOTSUPP;
259
260 case SIOCSIFMTU: /* Set the MTU of a device */
261 return dev_set_mtu(dev, ifr->ifr_mtu);
262
263 case SIOCSIFHWADDR:
264 if (dev->addr_len > sizeof(struct sockaddr))
265 return -EINVAL;
266 return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
267
268 case SIOCSIFHWBROADCAST:
269 if (ifr->ifr_hwaddr.sa_family != dev->type)
270 return -EINVAL;
271 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
272 min(sizeof(ifr->ifr_hwaddr.sa_data),
273 (size_t)dev->addr_len));
274 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
275 return 0;
276
277 case SIOCSIFMAP:
278 if (ops->ndo_set_config) {
279 if (!netif_device_present(dev))
280 return -ENODEV;
281 return ops->ndo_set_config(dev, &ifr->ifr_map);
282 }
283 return -EOPNOTSUPP;
284
285 case SIOCADDMULTI:
286 if (!ops->ndo_set_rx_mode ||
287 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
288 return -EINVAL;
289 if (!netif_device_present(dev))
290 return -ENODEV;
291 return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
292
293 case SIOCDELMULTI:
294 if (!ops->ndo_set_rx_mode ||
295 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
296 return -EINVAL;
297 if (!netif_device_present(dev))
298 return -ENODEV;
299 return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
300
301 case SIOCSIFTXQLEN:
302 if (ifr->ifr_qlen < 0)
303 return -EINVAL;
304 return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
305
306 case SIOCSIFNAME:
307 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
308 return dev_change_name(dev, ifr->ifr_newname);
309
310 case SIOCSHWTSTAMP:
311 err = net_hwtstamp_validate(ifr);
312 if (err)
313 return err;
314 fallthrough;
315
316 /*
317 * Unknown or private ioctl
318 */
319 default:
320 if ((cmd >= SIOCDEVPRIVATE &&
321 cmd <= SIOCDEVPRIVATE + 15) ||
322 cmd == SIOCBONDENSLAVE ||
323 cmd == SIOCBONDRELEASE ||
324 cmd == SIOCBONDSETHWADDR ||
325 cmd == SIOCBONDSLAVEINFOQUERY ||
326 cmd == SIOCBONDINFOQUERY ||
327 cmd == SIOCBONDCHANGEACTIVE ||
328 cmd == SIOCGMIIPHY ||
329 cmd == SIOCGMIIREG ||
330 cmd == SIOCSMIIREG ||
331 cmd == SIOCBRADDIF ||
332 cmd == SIOCBRDELIF ||
333 cmd == SIOCSHWTSTAMP ||
334 cmd == SIOCGHWTSTAMP ||
335 cmd == SIOCWANDEV) {
336 err = dev_do_ioctl(dev, ifr, cmd);
337 } else
338 err = -EINVAL;
339
340 }
341 return err;
342}
343
344/**
345 * dev_load - load a network module
346 * @net: the applicable net namespace
347 * @name: name of interface
348 *
349 * If a network interface is not present and the process has suitable
350 * privileges this function loads the module. If module loading is not
351 * available in this kernel then it becomes a nop.
352 */
353
354void dev_load(struct net *net, const char *name)
355{
356 struct net_device *dev;
357 int no_module;
358
359 rcu_read_lock();
360 dev = dev_get_by_name_rcu(net, name);
361 rcu_read_unlock();
362
363 no_module = !dev;
364 if (no_module && capable(CAP_NET_ADMIN))
365 no_module = request_module("netdev-%s", name);
366 if (no_module && capable(CAP_SYS_MODULE))
367 request_module("%s", name);
368}
369EXPORT_SYMBOL(dev_load);
370
371/*
372 * This function handles all "interface"-type I/O control requests. The actual
373 * 'doing' part of this is dev_ifsioc above.
374 */
375
376/**
377 * dev_ioctl - network device ioctl
378 * @net: the applicable net namespace
379 * @cmd: command to issue
380 * @ifr: pointer to a struct ifreq in user space
381 * @need_copyout: whether or not copy_to_user() should be called
382 *
383 * Issue ioctl functions to devices. This is normally called by the
384 * user space syscall interfaces but can sometimes be useful for
385 * other purposes. The return value is the return from the syscall if
386 * positive or a negative errno code on error.
387 */
388
389int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)
390{
391 int ret;
392 char *colon;
393
394 if (need_copyout)
395 *need_copyout = true;
396 if (cmd == SIOCGIFNAME)
397 return dev_ifname(net, ifr);
398
399 ifr->ifr_name[IFNAMSIZ-1] = 0;
400
401 colon = strchr(ifr->ifr_name, ':');
402 if (colon)
403 *colon = 0;
404
405 /*
406 * See which interface the caller is talking about.
407 */
408
409 switch (cmd) {
410 case SIOCGIFHWADDR:
411 dev_load(net, ifr->ifr_name);
412 ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
413 if (colon)
414 *colon = ':';
415 return ret;
416 /*
417 * These ioctl calls:
418 * - can be done by all.
419 * - atomic and do not require locking.
420 * - return a value
421 */
422 case SIOCGIFFLAGS:
423 case SIOCGIFMETRIC:
424 case SIOCGIFMTU:
425 case SIOCGIFSLAVE:
426 case SIOCGIFMAP:
427 case SIOCGIFINDEX:
428 case SIOCGIFTXQLEN:
429 dev_load(net, ifr->ifr_name);
430 rcu_read_lock();
431 ret = dev_ifsioc_locked(net, ifr, cmd);
432 rcu_read_unlock();
433 if (colon)
434 *colon = ':';
435 return ret;
436
437 case SIOCETHTOOL:
438 dev_load(net, ifr->ifr_name);
439 rtnl_lock();
440 ret = dev_ethtool(net, ifr);
441 rtnl_unlock();
442 if (colon)
443 *colon = ':';
444 return ret;
445
446 /*
447 * These ioctl calls:
448 * - require superuser power.
449 * - require strict serialization.
450 * - return a value
451 */
452 case SIOCGMIIPHY:
453 case SIOCGMIIREG:
454 case SIOCSIFNAME:
455 dev_load(net, ifr->ifr_name);
456 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
457 return -EPERM;
458 rtnl_lock();
459 ret = dev_ifsioc(net, ifr, cmd);
460 rtnl_unlock();
461 if (colon)
462 *colon = ':';
463 return ret;
464
465 /*
466 * These ioctl calls:
467 * - require superuser power.
468 * - require strict serialization.
469 * - do not return a value
470 */
471 case SIOCSIFMAP:
472 case SIOCSIFTXQLEN:
473 if (!capable(CAP_NET_ADMIN))
474 return -EPERM;
475 fallthrough;
476 /*
477 * These ioctl calls:
478 * - require local superuser power.
479 * - require strict serialization.
480 * - do not return a value
481 */
482 case SIOCSIFFLAGS:
483 case SIOCSIFMETRIC:
484 case SIOCSIFMTU:
485 case SIOCSIFHWADDR:
486 case SIOCSIFSLAVE:
487 case SIOCADDMULTI:
488 case SIOCDELMULTI:
489 case SIOCSIFHWBROADCAST:
490 case SIOCSMIIREG:
491 case SIOCBONDENSLAVE:
492 case SIOCBONDRELEASE:
493 case SIOCBONDSETHWADDR:
494 case SIOCBONDCHANGEACTIVE:
495 case SIOCBRADDIF:
496 case SIOCBRDELIF:
497 case SIOCSHWTSTAMP:
498 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
499 return -EPERM;
500 fallthrough;
501 case SIOCBONDSLAVEINFOQUERY:
502 case SIOCBONDINFOQUERY:
503 dev_load(net, ifr->ifr_name);
504 rtnl_lock();
505 ret = dev_ifsioc(net, ifr, cmd);
506 rtnl_unlock();
507 if (need_copyout)
508 *need_copyout = false;
509 return ret;
510
511 case SIOCGIFMEM:
512 /* Get the per device memory space. We can add this but
513 * currently do not support it */
514 case SIOCSIFMEM:
515 /* Set the per device memory buffer space.
516 * Not applicable in our case */
517 case SIOCSIFLINK:
518 return -ENOTTY;
519
520 /*
521 * Unknown or private ioctl.
522 */
523 default:
524 if (cmd == SIOCWANDEV ||
525 cmd == SIOCGHWTSTAMP ||
526 (cmd >= SIOCDEVPRIVATE &&
527 cmd <= SIOCDEVPRIVATE + 15)) {
528 dev_load(net, ifr->ifr_name);
529 rtnl_lock();
530 ret = dev_ifsioc(net, ifr, cmd);
531 rtnl_unlock();
532 return ret;
533 }
534 return -ENOTTY;
535 }
536}